I am running prefect 2.3 inside a docker container using the following command:

prefect orion start --host 0.0.0.0

I have a reverse proxy (traefik) pointing to the container and I can access the UI at

<https://my-host:4200>

. The reverse proxy is handling ssl offload. The UI is displayed, but unable to connect to the API and I'm receiving the following message:

Can't connect to Orion API at <http://127.0.0.1:4200/api>. Check that it's accessible from your machine.

Q. Is there a way to configure the Orion UI so that it uses a relative URL

/api

? (i.e. https://my-host:4200/api)?

Hi Michael, is there a reason for doing it this way over using kubernetes for doing something similar ? Are you just running this locally ? I believe is is a docker / kubernetes networking function (regarding the endpoint URI) and not something prefect configured

You can override the URL with this flag: https://docs.prefect.io/concepts/settings/#prefect_api_url I’m not 100% sure it overrides the UI’s api url, but it definitely overrides it for agents

Correct , that setting overrides the client side connection end point, not the server side configuration - it seems like you want to update the server side being hosted through nginx reverse proxy which is a base url / Reverse proxy mapping feature

this is a docker-compose environment. k8s is a massive overkill for what we're doing.

I believe

PREFECT_ORION_UI_API_URL

is the environment variable you will need to set to ensure the UI calls the correct API URL.

Thanks - setting

PREFECT_ORION_UI_API_URL

allows me to access the api. The significant downside is that I need to modify the configuration for each deployment. A relative URL would avoid the extra per-deployment configuration by simply re-using the protocol://host:port from which the UI is being served.